STUDY OF THE EFFECT OF RIVER MORPHOLOGICAL CHANGES ON FLOOD IN THE GELIS RIVER DOWNSTREAM, KUDUS REGENCY
Gelis River is located in the middle of Kudus Regency. In January 2014 there was a flood which caused major losses. The flooding was caused by high rainfall and sedimentation in the downstream of the river so that the storage capacity of the river is reduced. In addition, backwater occurs from the W...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/62728 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Gelis River is located in the middle of Kudus Regency. In January 2014 there was a flood which caused major losses. The flooding was caused by high rainfall and sedimentation in the downstream of the river so that the storage capacity of the river is reduced. In addition, backwater occurs from the Wulan River which is the confluence of the Gelis River. During the flood incident in early 2021, 25 m long embankment broke and caused inundation in 4 (four) villages to a height of 1 m. Due to this, the Ministry of Public Works and Public Housing carried out the Construction of the Gelis River Flood Control in 2020-2021. However, in the planning study, an analysis of sedimentation has not been carried out. Therefore, this study analyzes related to this.
The purpose of this study was to analyze changes in the bottom of the Gelis River channel on the existing profile and normalization, as well as analyze the rate of sedimentation that occurred and its comparison with the rate of erosion in the Gelis watershed. Hydrological analysis was carried out with the help of software and obtained a calibrated HSS SCS, then continued with an analysis of changes in river morphology using the Toffaletti model and 2 scenarios, namely the existing profile and the normalized profile. The bottom of the river channel resulting from the two simulations is modeled hydraulically with a design flood discharge (equivalent to Q25) to obtain the maximum water level at the time of flooding.
The results of the modeling show that the sedimentation rate downstream of the Gelis River is 8,914.59 tons/year. Changes in the bottom of the channel that occur in the form of degradation and agradation with a maximum value of 1.15 m for the existing profile, while the normalized profile undergoes an degradation of 0.6 m and a degradation of 1.02 m. An alternative solution that can be done in maintaining river capacity is to periodically dredge with at least 2.809,25 tons/year along the modeled river.
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